3 : the characteristic behavior or orderly procedure of a natural phenomenon or process

Did You Know?

We borrowed regimen straight from Latin, spelling and all—but in Latin, the word simply meant "rule" or "government." In English, it usually refers to a system of rules or guidelines, often for living a healthy life or taking a regular dose of exercise. The Latin regimen derives from another Latin word, the verb regere, which means "to lead straight" or "to rule." If you trace straight back from regere, you'll find that regimen has plenty of lexical kin, including correct, erect, region, rule, and surge. If you are using the training sense of regimen, be careful not to confuse the word with regiment, another regere descendant, which is used for a military unit.

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Examples

Sherry's personal trainer at the gym started her on a workout regimen of 30 minutes on the treadmill followed by 30 minutes of weight training.

"Her exchanges with the pharmacy staff served as informal check-ins that gave her a little extra help adhering to an unfamiliar medication regimen."
— Stacy Torres, The New York Times, 23 June 2017